Relax! Yes this bit will clear out of the uterus
naturally and there is no need to do a D&C.
test will continue to show positive till a few weeks after the miscarriage
. There was no need to have done it. Unnecessary investigations lead to more investigations. I would suggest that you get a Serum bHCG levels done. If high, repeat in 3-4 days. It should show declining trend. If not, get in touch with your doctor. Even blood levels may remain high upto 4 weeks after a miscarriage but they should show declining trend.
Your period is expected about 4 weeks after the miscarriage but use contraception
till you get your next period to avoid unexpected conception and thereby confusing your issues.
Hope this solves your query.